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09-03-2005, 07:34 AM | #1 | |
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The truth about gasoline
Here is some info about gasoline
A number of myths about octane have grown over the years. There is a widespread perception that the greater the octane the better the performance. However, once enough octane is supplied to prevent engine knock, there is little, if any, performance improvement. One exception to this would be in vehicles equipped with knock sensors. In these vehicles, if octane is insufficient, the computer will retard the timing to limit engine knock. If the vehicle is operating in the “knock limiting” mode (retarded timing), using a higher octane fuel will allow timing to be advanced, resulting in some level of performance increase. However, even in these vehicles, tests have shown that there is no perceptible performance improvement from using a fuel of higher octane than that recommended by the vehicle manufacturer. Another myth is that using a higher octane fuel will result in improved fuel economy (increased miles per gallon). Octane is nothing more than a measure of anti-knock quality. Fuel economy is determined by a number of variables including the energy content of the fuel. Some premium grades of fuel may contain components which increase energy content. In those cases, fuel economy may improve slightly as a result of higher energy content, but not as a result of the higher octane. Two fuels of identical octane could have different energy content due to compositional differences. Consumers need only use a gasoline meeting the vehicle manufacturer’s recommended octane levels. If engine knocking occurs on such fuels and mechanical causes have been eliminated, then the consumer should purchase the next highest octane gasoline (above the manufacturer's recommendation in the owners manual) that will provide knock-free operation. GO HERE FOR MORE INFO
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03-08-2006, 08:30 PM | #2 | ||
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Re: The truth about gasoline
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03-16-2006, 02:21 PM | #3 | |
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Re: The truth about gasoline
my 77 chevy p/u gets better MPG on 87 not 92 oct. fuel
it doesn't need it |
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03-17-2006, 03:16 AM | #4 | ||
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Re: The truth about gasoline
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03-23-2006, 06:22 PM | #5 | ||
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Re: The truth about gasoline
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your way off on your "lighter thing" you will hardly notice a difference. but higher octane will not give you better gas mileage, and it WILL give you more HP (but only because of the timing advance change your computer makes) |
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03-23-2006, 06:23 PM | #6 | ||
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Re: The truth about gasoline
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03-23-2006, 06:37 PM | #7 | ||
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Re: The truth about gasoline
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04-05-2006, 09:59 PM | #8 | |
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Re: The truth about gasoline
Here's all you really need to know, as long as you stick w/ a Chevron Brand gas you'll be fine. If your engine knocks answer it by getting it some Chevron w/ Techron. It will thank you! I have found that Chevron is the only brand that does not allow my vehicles to knock, any octane will work. You don't need the high octane unless your manufacture recommends it, as stated above.
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04-25-2006, 04:28 PM | #9 | |
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Re: The truth about gasoline
High octane fuels are for High compression vehicles only. I have encountered the myth about fuel economy many times, the differance high octane fuel provide in fuel economy (if any) is more than offset by the higher price. I do suggest blown or other high compression vehicles to use a higher octane level but going over 100 is unnessesary for any registered, street legal vehicle. My two cents are in, mind you they are canadian cents so they are not worth as much down there in the states
john custom cars are supposed to have bigger engines than stereos, but maybe i'm old fashioned. |
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07-14-2006, 11:21 AM | #10 | ||
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Re: The truth about gasoline
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08-11-2006, 02:16 AM | #11 | |
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Re: The truth about gasoline
Higher octane ratings correlate to higher activation energies. Activation energy is the amount of energy necessary to start a chemical reaction. If you guys drive old vehicles with some real power under the hood you'll see the difference between 87 octane and 93 octane. Try adding 110 racing fuel to the mix. Also Real comparisons cannot be made from tank to tank. Your fuel tank holds a few gallons that dont get used. Adding 93 to a tank that had 87 in it doenst give you 93. Gives you a mix of 87 and 93. I also think more goodies go into 93.
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12-01-2006, 12:28 PM | #12 | |
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It's WW2 Voodoo
YOu can find the story online. Scan under 130 octane aviation fuel.
thanks Reg |
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12-02-2006, 04:45 AM | #13 | ||
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Re: It's WW2 Voodoo
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12-02-2006, 10:19 AM | #14 | |
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good point, comp.
http://www.centennialofflight.gov/es...uel/Tech21.htm
heres one of many sites. Prof. Walmsley told me , decades ago, that the Americans won the chemistry / Physics, & the allies the tech, war by lettign smart officers & boffins work together & make decsiions without political meddling. The Gaulieters, right up to Zie Furher, screwed up the home front big time. Cheers Reg |
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12-02-2006, 10:34 AM | #15 | ||
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Re: good point, comp.
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